Cover of: Corundum | Richard W. Hughes Read Online


  • 890 Want to read
  • ·
  • 67 Currently reading

Published by Butterworth-Heinemann in London, Boston .
Written in English


  • Corundum.

Book details:

Edition Notes

Includes bibliographical references.

StatementRichard W. Hughes.
SeriesButterworths gem books
LC ClassificationsQE391.C9 H84 1990
The Physical Object
Paginationxviii, 314 p., [4] p. of plates :
Number of Pages314
ID Numbers
Open LibraryOL19720877M
ISBN 100750610069

Download Corundum


  The Corundum Conundrum (Marcus Lear Mysteries Book 2) - Kindle edition by EARP, J. KEVIN. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading The Corundum Conundrum (Marcus Lear Mysteries Book 2)/5(6). Corundum in its pure state is colourless, but the presence of small amounts of impurities can impart a broad range of hues to the mineral. Ruby owes its red colour to chromium, sapphire its blue shades to the presence of iron and titanium; most corundum contains nearly 1 percent iron oxide. The mineral readily weathers to other aluminous minerals—e.g., margarite, zoisite, sillimanite, and. Corundum. Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Corundum is used as a gemstone, abrasive, refractory and much more. Red corundum is a ruby, blue is a sapphire, any other color is a fancy sapphire. Synthetic corundum is used instead of natural corundum in most applications.

Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue. Page 66 - Shepard* in an extended article on the corundum of North Carolina and Georgia, describes the occurrences of corundum and chrysolite, the associated minerals and what he calls the development of the "Strata" which "exhibit the following order of formations: 1. Chrysolitic rock somewhat mixed with anthophyllite ; 2. a layer of micaceous rock; 3. a seam of chalcedony ; 4. a stratum of. Every other color of Corundum is known as Sapphire, even the pink ones! In ancient times, the terms sapphirus, sappheiros, sappir and sanipriya were applied to many opaque blue stones, especially in western civilizations according to Bruce G. Knuth in his book Gems in Myth, Legend, and Lore. For this reason, some texts refer to what we know.   "This book is a deep contribution to the knowledge of gem corundum and I could compliment it for hours, so great a pleasure is it to read. The Asian bibliography is so rich that it will be useful to generations of gemmologists " - Professor François-Hubert Reviews: 7.

Corundum is one of the Jewels of the Elid found in can be obtained from mining corrupted crystals or looting chests in the Shifting Tombs, with a 1/ drop rate. Collecting all 16 gems grants the Jewelled Scarab pet and completes the Rock and Roll achievement.. Hint given in the journal: We don't condone ransacking tombs, but recent geological activity makes retrieving these more. This book is the first from Richard Hughes on the subject, and the first major work to be devoted entirely to the corundum family of gemstones. It covers all aspects of rubies and sapphires, beginning with their history, chemical and physical properties. Corundum is a mineral species that includes two world’s most precious gemstones, ruby and they are the same mineral, sapphire and ruby are often found together. Sapphire is far more common variety, as ruby requires a specific element and an appropriate host rock to supply its essential chromium. The chemical formula of corundum is Al2O3 (aluminum oxide) and pure corundum . Corundum is very compact, dense, and lacks gemstone cleavage. It’s also the second hardest natural mineral after diamond. Gem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry stones. Ruby is the red variety of corundum. All other colors of corundum, including colorless.